Method for milling a cutout in a workpiece, and workpiece having a cutout

Patent metadata

Field	Value
Publication number	US-9561535-B2
Application number	US-201113880307-A
Country	US
Kind code	B2
Filing date	Dec 14, 2011
Priority date	Dec 17, 2010
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A method for milling a cutout using a milling cutter in a workpiece is provided. A longitudinal axis of the milling cutter is positioned in a first orientation relative to the workpiece to contact a first side of the workpiece. An enveloping cylindrical surface of the milling cutter is then used to cut a cutout which has a plurality of peripheral edges and rounded corners. The milling cutter is then placed in a second orientation which is angled relative to the first orientation. Thereafter, the enveloping cylindrical surface and an enveloping axial surface of the milling cutter are used to further cut the rounded corners of the cutout to form sharp corners.

First claim

The invention claimed is:

1. A method for milling a cutout comprising:
providing a workpiece having first and second opposite sides, and a body extending between the opposite sides;
providing a milling cutter having a longitudinal axis, an enveloping cylindrical surface and a front surface forming an enveloping axial surface;
positioning the longitudinal axis of the milling cutter in a first orientation relative to the workpiece such that the milling cutter contacts the first side of the workpiece;
using the enveloping cylindrical surface of the milling cutter when positioned in the first orientation to cut a cutout in the body of the workpiece, the cutout having a plurality of peripheral edges and rounded corners joining adjacent peripheral edges together, wherein the longitudinal axis of the milling cutter is parallel to the peripheral edges in the first orientation;
positioning the longitudinal axis of the milling cutter in a second orientation, the second orientation being angled relative to the first orientation; and
using the enveloping cylindrical surface and the enveloping axial surface of the milling cutter when positioned in the second orientation to further cut the rounded corners of the cutout to form sharp corners.

2. The method of claim 1 , wherein a die is formed by said method.

3. The method of claim 1 , wherein said second orientation is transverse to said first orientation.

4. The method of claim 1 , wherein said second orientation is substantially transverse to said first orientation.

5. The method of claim 1 , wherein said milling cutter includes a groove, and wherein when the cutout is cut by said milling cutter, said groove on said milling cutter forms a projection in said peripheral edges of the first cutout.

6. The method of claim 5 , wherein said milling cutter forms a bevel on said peripheral edges of said cutout when said milling cutter is in said second orientation.

7. The method of claim 6 , wherein a die is formed by said method.

8. The method of claim 1 , wherein said milling cutter forms a bevel on said peripheral edges of said cutout when said milling cutter is in said second orientation.

9. The method of claim 8 , wherein a die is formed by said method.

10. The method of claim 1 , further including cutting a window through said body, said window being in communication with said cutout, and said milling cutter is inserted through said window in said second orientation.

11. The method of claim 10 , further including cutting a second window through said body, said second window being in communication with said cutout, and said milling cutter is further inserted through said second window in said second orientation to further cut the corners of said cutout.

12. The method of claim 11 , wherein a die is formed by said method.

13. The method of claim 1 , wherein said cutout is a first cutout having a depth which is less than a thickness of said workpiece; and further comprising:
using said milling cutter to form a second cutout in said workpiece by entering the workpiece from said second side of said workpiece, said second cutout having peripheral sides having a first depth and corners joining said peripheral sides together, said second depth being less than the thickness of said workpiece; and
wherein portions of said first cutout and said second cutout overlap each other along the thickness of said workpiece.

14. The method of claim 13 , wherein a die is formed by said method.

15. The method of claim 13 , wherein when said first cutout is formed, said milling cutter forms first over-run areas which extend past said corners of said first cutout.

16. The method of claim 15 , wherein when said second cutout is formed, said milling cutter forms second over-run areas which extend past said corners of said second cutout, said second over-run areas do not align with said first over-run areas.

17. The method of claim 1 , wherein each sharp corner has a deviation from a geometric sharp edge of less than two millimeters.

18. The method of claim 1 , wherein each sharp corner forms a right angle.

Assignees

• Frenken Egbert
• Klauke Gmbh Gustav

Inventors

• Frenken Egbert

Classifications

• B26F1/44

  Cutters therefor; Dies therefor · CPC title

• B23C3/00 Primary

  Milling particular work; Special milling operations; Machines therefor (milling gear-teeth B23F, {heat assisted machining B23P25/00}) · CPC title

• B21D37/205 Primary

  Making cutting tools · CPC title

• Y10T409/303752

  Process · CPC title

• Y10T83/9437

  Shear-type female tool · CPC title